JPH10296344A - Easily bendable rigid plate and production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a straight thin wall part between two ends of a rigid plate by using a die on which a narrow width straight projection with a height lower than a clearance is formed on one side inner face of a pair of plane like pressing plates having the clearance almost same as the thickness of the rigid plate and a prescribed breadth. SOLUTION: An upper die 12 is provided with projected line having an almost V-shaped cross section on the central part of a plane part 13 of a flat board. Recessed grooves 3 are formed on both side edges of the projected line. A rigid flat plate is inserted between such pressing dies, it is pressed and a bendable steel plate having a V groove formed with a straight thin wall part on the central part is formed. Low and thick wall parts are formed on both sides of the V groove corresponding to the recessed groove of the die. By using the pressing die as well as a die for roll forming, for example, a galvanized steel sheet can be worked. Such a bendable steel plate is stored and carried as flat and it can be directly bent manually at the V groove place near the using site and it can be used as an angle bar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid plate such as a steel plate which can be easily bent by hand at a use site and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in order to bend a rigid plate such as a steel plate, a craftsman makes a groove on the site like a tin plate,
Except for manual work such as bending thinned parts, there was no better way than bending using a machine such as a bender. For example, large prismatic and half-prism-shaped steel plates are formed at a factory and transported to a site or the like in that state.

[0003] A steel plate or the like is pressed with a V-shaped mold to form a straight V-shaped groove in a flat plate, and is carried in that state.
It was of course possible in theory to be used refracted in the field. However, using a V-shaped mold, the. It is extremely difficult to mass-produce by controlling the thickness to a certain number of millimeters, and it is currently not used.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rigid plate such as a steel plate which is easily bent in the field by providing V-shaped or U-shaped grooves in a straight line.

[0005]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides a gap substantially equal to the thickness of a rigid plate and at least one of a pair of flat pressing plates having a predetermined width. Pressing the rigid plate by machining such as press or roll forming using a mold with a narrower and narrower projection than the gap on the inner surface of the rigid plate, between the two ends of the rigid plate,
This is to form a linear thin portion.

[0006]

With such a configuration, the rigid plate to be processed is sandwiched by the flat pressing plate having a certain width over the entire surface, so that the interval between the pressing plates at the time of pressurization is always substantially constant. Can be kept. If the pressing plate is provided with a projection smaller than the plate thickness, the rigid plate can be formed thinner by the height of the projection. If a relief area for the thinned portion is provided at the edge of the projection when pressing, the processing can be further facilitated. If a mold corresponding to the thickness of the rigid plate to be processed is used, the V-groove can be formed stably without special skill when pressing. If the thickness of the thinned portion is about 1 mm, it is possible to easily bend on site using a simple jig that can be operated manually without a large-scale machine.

[0007]

Embodiment 1 FIG. 1 shows a press working die 1. The lower mold 11 is a flat plate having a width of 20 cm and a length of 2 m. The upper mold 12 has a width of 20 cm,
At the center of the flat portion 13 of a flat plate having a length of 2 meters, a ridge 2 having a width of 5 mm and a height of 2.5 mm and a substantially V-shaped cross section is provided. A concave groove 3 having a width of 5 mm and a depth of 3 mm is provided on both side edges of the ridge.

A rigid flat plate made of a galvanized steel plate having a thickness of 3 mm, a width of 20 cm and a length of 2 m is sandwiched between such press dies, and pressed as shown in FIG. The refractible steel plate 4 having a V groove 41 at the center is formed. Low thick portions 42 are formed on both sides of the V groove corresponding to the concave groove of the mold. As shown in FIG. 3, such a refractible steel plate 4 is stored and transported in a flat state, and near the site of use, the portion of the V groove is bent at a right angle by human power and used as an angle member 5. Is possible.

As shown in FIG. 4, the ridges 2 can be attached to both upper and lower dies of the press working die 1. However, in this case, it is desirable to shift the position of the ridge 2. When the ridges 2 attached to the processing die are installed at the same position as shown in FIG. 5, the total height of the upper and lower ridges needs to be smaller than the thickness of the rigid flat plate to be formed. Otherwise, when the rigid flat plate is pressed, there is a possibility that the rigid flat plate will be caught between the upper and lower convex ridges and cut at that location.

[0010]

Embodiment 2 An example is shown in which the upper and lower rolls each have a diameter of 20 cm and use a roll forming machine having a total of three stages of rolls. FIG. 6 shows the final forming roll 6 of the forming machine. The forming roll has a width of 40 cm, the lower roll 61 has a flat surface, and the upper roll 62 has a center portion having a width of 10 cm, and is formed of a repetitive smooth wavy ridge 21.
Is provided. The corrugated ridges 21 are low in the first-stage roll, and are gradually increased to finally 2.5 mm. On each side edge of the corrugated ridge, a concave groove 3 having a width of 1 cm and a height of 5 mm is provided on each roll.

[0011] The space between the roll forming dies is formed through a rigid flat plate of 3.2 mm thick galvanized steel sheet and cut to a predetermined length of 1 meter or 2 meters. As shown in FIG. 7, a refractible steel plate 4 having two corrugated grooves 43 on the surface is formed.

When the refractible steel sheet formed as described above is used, it is bent at the location of the corrugated groove with the corrugated groove 42 facing outward, and formed into a semi-cylindrical body 7 as shown in FIG. I do. To reinforce the refraction point, as shown in the figure, a spot-welding is performed on the spot along the outer corner with a reinforcement angle 51 made of a narrow refraction piece bent to a refraction angle, for example, refracted at a right angle. It is also possible to reinforce the refraction portion by a method such as.

The reinforcing angle may be provided along the inside of the semi-cylindrical body. Further, it is also possible to attach a reinforcing tape formed of a flexible sheet having high strength to protect the bending portion.

As shown in FIG. 9, V-grooves 41 are formed alternately on the front and back of a rigid flat plate at regular intervals to form a refractible steel plate 4, and when used, the plate is bent at the V-grooves. Figure 1
It is also possible to form a corrugated sheet 8 as shown in FIG.

[0015]

Third Embodiment The shape of a refractible rigid plate is not limited to a rectangle. For example, as shown in FIG. 11, a V-shaped groove 41 that crosses the bases of the four protrusions 44 of the cross-shaped rigid flat plate 40 is provided to form the refractible steel plate 4, and the protrusions are respectively formed at right angles upward. It is also possible to bend into a box shape.

In the present invention, the rigid plate used is mainly a flat plate such as a steel plate, a galvanized steel plate, stainless steel, or aluminum, but may be a perforated plate such as a punched metal or an expanded metal, or may be a pressurized plate. The material is not limited as long as the material is flexible as long as it can form a concave groove and can be bent at a thinly formed portion.

[0017]

Since the surface of the mold is widened and the rigid plate is pressed by the surface, a gap is naturally formed between the upper and lower molds. By providing a convex strip having a thickness smaller than the plate thickness in the mold, the V-groove can be formed stably without fear of cutting the rigid plate. If a concave groove is provided on the edge of the ridge, when forming the V groove, a relief area for the material in that part is formed, so that pressing can be performed without difficulty and a V groove with an average depth can be formed. .

Since the formed refractible plate has a small volume in a flat state, it is easy and convenient to store and transport it.
In addition, since refraction is easy, when used, a cylindrical, semi-cylindrical, box-shaped or the like can be easily formed without a large-scale machine or the like at the site, which is convenient. In addition, it is convenient because it is easy to reinforce the refraction portion after refraction with a reinforcing angle, a reinforcing tape or the like. When a flexible tape is used, it is possible to reinforce the tape in a flat state before bending.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a press die.

FIG. 2 is a front view showing an example of a refractible plate.

FIG. 3 is a front view showing a state where a refractible plate is bent.

FIG. 4 is a front view showing another example of the pressing die.

FIG. 5 is a front view showing another example of the pressing die.

FIG. 6 is a front view showing another example of the forming mold.

FIG. 7 is a front view showing another example of the refractible plate.

FIG. 8 is a front view showing a semi-cylindrical body made of a refractible plate.

FIG. 9 is a front view showing another example of the refractible plate.

FIG. 10 is a front view showing a state in which a refractible plate is formed into a corrugated plate.

FIG. 11 is a plan view showing a refractible plate having a box shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing die 11 Lower die 12 Upper die 13 Flat part 2 Convex ridge 21 Corrugated ridge 3 Concave groove 4 Refractible steel plate 40 Rigid flat plate 41 V groove 42 Thick part 43 Wave form groove 44 Projection part 5 Angle material 51 Reinforcement angle 6 Forming roll 61 Lower roll 62 Upper roll 7 Half cylindrical body 8 Corrugated plate

Claims (6)

[Claims] 1. A linear projection that is narrower and narrower than the gap and is provided on a gap substantially equal to the thickness of the rigid board and on at least one inner surface of a pair of flat pressing plates having a predetermined width. The rigidity is easy to bend, characterized by pressing a rigid plate by machining such as press and roll forming by using a mold provided with a die, and forming a linear thin portion between two ends of the rigid plate. Board production method. 2. The method according to claim 1, wherein the flat pressing plate is formed on both inner surfaces of the projection. 3. The method according to claim 1, wherein a plurality of thin portions parallel to each other are provided at narrow intervals. 4. The method according to claim 1, wherein an edge of the projection is provided with a concave groove. 5. The projection according to claim 1, wherein the projections are provided at a plurality of positions on the pressing plate.
A method of producing a rigid plate that can be easily bent. 6. A rigid plate which is easy to bend, wherein one continuous linear thin portion is formed between at least two ends by the method according to claim 1.